Engine catalyst activation determining device and engine control

Details Engine catalyst activation determining device and engine control Engine catalyst activation determining device and engine control

1997-01-22

1999-09-07

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60285, 60289, F01N 300

Patent

active

059469072

ABSTRACT:
The determining precision of catalyst activation, which is the basis for stopping a secondary air supply to accelerate catalyst activation and start air-fuel ratio feedback control, is enhanced. An engine cooling water temperature is detected, and a catalyst activation water temperature is determined from an engine startup water temperature based on predetermined characteristics. The catalyst activation water temperature is set to be lower the lower the startup cooling water temperature, and is set such that a difference between a predetermined temperature and an engine startup cooling water temperature is larger the lower the startup cooling water temperature. In this way, catalyst activation is determined with high precision according to the startup water temperature and subsequent cooling water temperature variation.

REFERENCES:
patent: 5462039 (1995-10-01), Mamiya et al.
patent: 5535586 (1996-07-01), Ohta et al.
patent: 5577383 (1996-11-01), Kuroda et al.
patent: 5675968 (1997-10-01), Katashiba et al.

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